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The retired musician had admitted committing 39 offences against six male victims in court on December 5, 2017.

The offences include seven counts of buggery and one count of attempted buggery with a victim under 16, incitement to commit buggery, 13 counts of indecency with an under 14, 15 counts of indecent assault on an under 16 and two counts of making indecent images.

He will also be on the sex offenders' register for life.

Police were first contacted by one of Duncan's victims in March 2016. Three other victims subsequently came forward towards the end of 2016 and early 2017. They all told officers that they had been assaulted by Duncan as young boys in the 1970s.

Duncan would show the boys pornographic material before forcing them to perform sex acts.

Officers quickly established that he had offended across west London and the home counties.

Neil Duncan pleaded guilty to:

One count of attempted buggery with a victim aged under 16;

Seven counts of buggery with a victim aged under 16;

One count of incitement to commit buggery;

13 counts of indecency with a child under the age of 14 years;

15 counts of indecent assault on a male under the age of 16 years; and,

Two counts of making indecent images.

'Prolific offender'

Detective Constable Amy Dobner, from the Child Abuse and Sexual Offences (CASO) Command, said: "Duncan is a prolific offender who spent the 1970s abusing young children. I am grateful that they have since come forward so that we could take the necessary action to bring him before the courts.

"I would like to take this opportunity to praise their bravery and resolve, and hope that today will further help them move on with their lives, knowing that Duncan has been punished for his crimes.”

Duncan was arrested on August 4, 2016. A number of computers were seized and found to contain indecent images.

Officers also discovered several diaries that were kept by Duncan which corroborated the allegations.

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More victims

Detective Chief Inspector John Foulkes of CASO said: “Given the number of victims and offences that Duncan has admitted to, it cannot be ruled out that there are other victims who have yet to contact police.

“I would urge anyone who has been abused by Neil Duncan to come forward and speak to police where you will be supported by specially trained officers.”

Anyone with information is asked to contact the Barnet Child Abuse and Sexual Offences team on 020 8733 5139.